Nearsight prevents the activation of "long ranged" abilities, which seems to include any ability that can input targets via the minimap. By virtue of disabling the second cast, Nearsight will interrupt Elastic SlingshotElastic Slingshot. This may be a bug, although it is thematically appropriate for an effect that removes the target's ability to see.

Crowd control applied by one's self or an ally cannot be countered in any way (neither reduced, resisted, nor removed), with the exception of self-slows.

Airborne

A unit that is made airborne is moved in a specified direction or to a specific point. For the duration, the unit is also 20pxstunned and cannot move, attack, cast abilities, activate items or use the summoner spellsFlashFlash and TeleportTeleport.

Interrupts:

Interrupts all channeled and charged abilities, as well as Glacial StormGlacial Storm, all dash abilities and other airborne effects.

Reduction:

Only the stun component duration is reduced by Tenacity, which stacks multiplicatively. Forced movement's execution time remains unaffected.

To expand upon the countering of airborne effects, consider that the effects are made up of two components: a movement modifier (called a "move block" by Riot, referring to a chunk of code) and a stun (which is responsible for the disabling attacking and casting). As a general rule, the most recent move block will over-rule any previous move blocks, which is how Alistar'sHeadbutt and Pulverize combo functions. This rule also extends to all beneficial movement modifiers, such as dashes and blinks, which is why Rocket GrabRocket Grab and Rocket JumpRocket Jump will over-rule each other depending on their order of activation. Most beneficial movement modifiers do not prevent the activation of abilities, allowing TristanaTristana to still activate abilities during Rocket JumpRocket Jump but not during Rocket GrabRocket Grab).

Through the use of cleansing effects or tenacity, players can remove the stun and subsequently activate abilities such as FlashFlash or champion-specific dashes to break the airborne's move block.

Note that CleanseCleanse is special-cased to not remove the stunning effects, but is still available to cast. One or the other may be a bug.

In some instances, the stun duration is longer than the move block (e.g. Sion'sSion'sUnstoppable OnslaughtUnstoppable Onslaught), but in most cases they are the same duration. There have been cases in the past where the stun duration was shorter, but this usually lead to bug-like interactions and was later "fixed" (e.g. Azir'sEmperor's DivideEmperor's Divide did not apply any stun at all in the initial charge on the ability, which allowed his enemies to use Flash/dash to supersede the charge's knockback and get over the wall).

Knockback

The target is made airborne in a direction directly away from the point of cast.

Blind

A unit that is blinded will "Miss" their basic attacks, similar to when attacking a target with dodge. Missed attacks will fail to deal damage or apply on-hit effects, with the exception of Rolling ThunderRolling Thunder and Devastating ChargeDevastating Charge. Unlike Disarm, Blind does not prevent the unit from declaring attacks. Blind causes Graves'Graves' shotgun to fire pellets with a random spread, excluding the direction of his target.

Interrupts:

Does not interrupt any abilities, but will prevent on-hit effects from being triggered. This does not waste the effects, however, and they will simply wait until a successful attack lands.

ThornmailThornmail's passive returns 30% of all physical damage back to the attacker as magic damage before the damage is reduced by any effect, including blind. So it still applies if the target is blinded.

Blinded enemies will only miss if they attack while blinded; ranged units still hit if the projectile fires before the blind.

Forced action

Charm

A unit that is charmed will move toward the source for the duration, during which time they cannot control their own movement or attacks, and cannot cast abilities, activate items or use the summoner spellsFlashFlash and TeleportTeleport.

A unit that is fleeing will move directly away from the source, during which time they cannot control their own movement or attacks, and cannot cast abilities, activate items or use the summoner spellsFlashFlash and TeleportTeleport. Versus non-champions, flee instead causes the target to move around aimlessly or stand immobilized.

Uniquely to Volibear, fear slows the target by 100% which causes it to stay in place and turn around aimlessly instead of away from the source.

Taunt

A unit that is taunted will attempt to attack the source for the duration, during which time they cannot control their own movement or attacks, and cannot cast abilities, activate item or use the summoner spellsFlashFlash and TeleportTeleport.

The only example of Ground is a persistent area of effect, which continually refresh. Olaf'sOlaf'sRagnarokRagnarok is the only ability that both removes crowd control and grants immunity to subsequent effects.

A unit that is asleep is unable to control its movement, declare attacks, cast abilities, activate items or use the summoner spellsFlashFlash and TeleportTeleport for the duration, as with stun. The duration is substantially longer than other crowd control effects, but will be interrupted if the target takes damage.

GalioGalio and ShacoShaco are the only ones who can reduce movement speed below 110, to 60 and 100 respectively. This movement speed is set and cannot be modified, but it can be cleansed by slow immunity.

Stasis

A unit that is in stasis is unable to control movement, declare attacks, cast abilities, activate items or use any summoner spell for the duration, while also being 20pxinvulnerable and 20pxuntargetable.

Suspension

A unit that is suspended is made Airborne on the spot and is also 20pxstunned, preventing them from moving, attacking, casting abilities, activating items or using the summoner spellsFlashFlash and TeleportTeleport. The distinction between Suspension and a traditional Airborne is that a Suspension is affected by crowd control reduction and can be fully removed by cleansing effects.

Interrupts:

Interrupts all channeled and charged abilities, as well as Glacial StormGlacial Storm, all dash abilities and other airborne effects.